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� 1 <br /> 4-inch Casing <br /> 20 , bg <br /> 25' bg <br /> 30' bg <br /> `1 ,h <br /> 40 ' bg <br /> VIJ Grout <br /> Blank Casing <br /> ® Bentonite <br /> Sand ® Screened Casing <br /> Blakely Environmental Well Construction Diagram <br /> Investigations, <br /> Inc. FRONTIER TRANSPORTATION Figure 5 <br /> Wrightwood, CA 92397 Tracy, California <br />